1/* ------------------------------------------------------------
   2 * ibmvscsi.c
   3 * (C) Copyright IBM Corporation 1994, 2004
   4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
   5 *          Santiago Leon (santil@us.ibm.com)
   6 *          Dave Boutcher (sleddog@us.ibm.com)
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  21 * USA
  22 *
  23 * ------------------------------------------------------------
  24 * Emulation of a SCSI host adapter for Virtual I/O devices
  25 *
  26 * This driver supports the SCSI adapter implemented by the IBM
  27 * Power5 firmware.  That SCSI adapter is not a physical adapter,
  28 * but allows Linux SCSI peripheral drivers to directly
  29 * access devices in another logical partition on the physical system.
  30 *
  31 * The virtual adapter(s) are present in the open firmware device
  32 * tree just like real adapters.
  33 *
  34 * One of the capabilities provided on these systems is the ability
  35 * to DMA between partitions.  The architecture states that for VSCSI,
  36 * the server side is allowed to DMA to and from the client.  The client
  37 * is never trusted to DMA to or from the server directly.
  38 *
  39 * Messages are sent between partitions on a "Command/Response Queue" 
  40 * (CRQ), which is just a buffer of 16 byte entries in the receiver's 
  41 * Senders cannot access the buffer directly, but send messages by
  42 * making a hypervisor call and passing in the 16 bytes.  The hypervisor
  43 * puts the message in the next 16 byte space in round-robin fashion,
  44 * turns on the high order bit of the message (the valid bit), and 
  45 * generates an interrupt to the receiver (if interrupts are turned on.) 
  46 * The receiver just turns off the valid bit when they have copied out
  47 * the message.
  48 *
  49 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
  50 * (IU) (as defined in the T10 standard available at www.t10.org), gets 
  51 * a DMA address for the message, and sends it to the server as the
  52 * payload of a CRQ message.  The server DMAs the SRP IU and processes it,
  53 * including doing any additional data transfers.  When it is done, it
  54 * DMAs the SRP response back to the same address as the request came from,
  55 * and sends a CRQ message back to inform the client that the request has
  56 * completed.
  57 *
  58 * Note that some of the underlying infrastructure is different between
  59 * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
  60 * the older iSeries hypervisor models.  To support both, some low level
  61 * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
  62 * The Makefile should pick one, not two, not zero, of these.
  63 *
  64 * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
  65 * interfaces.  It would be really nice to abstract this above an RDMA
  66 * layer.
  67 */
  68
  69#include <linux/module.h>
  70#include <linux/moduleparam.h>
  71#include <linux/dma-mapping.h>
  72#include <linux/delay.h>
  73#include <linux/slab.h>
  74#include <linux/of.h>
  75#include <linux/pm.h>
  76#include <linux/kthread.h>
  77#include <asm/firmware.h>
  78#include <asm/vio.h>
  79#include <scsi/scsi.h>
  80#include <scsi/scsi_cmnd.h>
  81#include <scsi/scsi_host.h>
  82#include <scsi/scsi_device.h>
  83#include <scsi/scsi_transport_srp.h>
  84#include "ibmvscsi.h"
  85
  86/* The values below are somewhat arbitrary default values, but 
  87 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
  88 * Note that there are 3 bits of channel value, 6 bits of id, and
  89 * 5 bits of LUN.
  90 */
  91static int max_id = 64;
  92static int max_channel = 3;
  93static int init_timeout = 300;
  94static int login_timeout = 60;
  95static int info_timeout = 30;
  96static int abort_timeout = 60;
  97static int reset_timeout = 60;
  98static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
  99static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
 100static int fast_fail = 1;
 101static int client_reserve = 1;
 
 
 
 102
 103static struct scsi_transport_template *ibmvscsi_transport_template;
 104
 105#define IBMVSCSI_VERSION "1.5.9"
 106
 107static struct ibmvscsi_ops *ibmvscsi_ops;
 108
 109MODULE_DESCRIPTION("IBM Virtual SCSI");
 110MODULE_AUTHOR("Dave Boutcher");
 111MODULE_LICENSE("GPL");
 112MODULE_VERSION(IBMVSCSI_VERSION);
 113
 114module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
 115MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
 116module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
 117MODULE_PARM_DESC(max_channel, "Largest channel value");
 118module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
 119MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
 120module_param_named(max_requests, max_requests, int, S_IRUGO);
 121MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
 122module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
 123MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
 124module_param_named(client_reserve, client_reserve, int, S_IRUGO );
 125MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
 126
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 127/* ------------------------------------------------------------
 128 * Routines for the event pool and event structs
 129 */
 130/**
 131 * initialize_event_pool: - Allocates and initializes the event pool for a host
 132 * @pool:	event_pool to be initialized
 133 * @size:	Number of events in pool
 134 * @hostdata:	ibmvscsi_host_data who owns the event pool
 135 *
 136 * Returns zero on success.
 137*/
 138static int initialize_event_pool(struct event_pool *pool,
 139				 int size, struct ibmvscsi_host_data *hostdata)
 140{
 141	int i;
 142
 143	pool->size = size;
 144	pool->next = 0;
 145	pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
 146	if (!pool->events)
 147		return -ENOMEM;
 148
 149	pool->iu_storage =
 150	    dma_alloc_coherent(hostdata->dev,
 151			       pool->size * sizeof(*pool->iu_storage),
 152			       &pool->iu_token, 0);
 153	if (!pool->iu_storage) {
 154		kfree(pool->events);
 155		return -ENOMEM;
 156	}
 157
 158	for (i = 0; i < pool->size; ++i) {
 159		struct srp_event_struct *evt = &pool->events[i];
 160		memset(&evt->crq, 0x00, sizeof(evt->crq));
 161		atomic_set(&evt->free, 1);
 162		evt->crq.valid = 0x80;
 163		evt->crq.IU_length = sizeof(*evt->xfer_iu);
 164		evt->crq.IU_data_ptr = pool->iu_token + 
 165			sizeof(*evt->xfer_iu) * i;
 166		evt->xfer_iu = pool->iu_storage + i;
 167		evt->hostdata = hostdata;
 168		evt->ext_list = NULL;
 169		evt->ext_list_token = 0;
 170	}
 171
 172	return 0;
 173}
 174
 175/**
 176 * release_event_pool: - Frees memory of an event pool of a host
 177 * @pool:	event_pool to be released
 178 * @hostdata:	ibmvscsi_host_data who owns the even pool
 179 *
 180 * Returns zero on success.
 181*/
 182static void release_event_pool(struct event_pool *pool,
 183			       struct ibmvscsi_host_data *hostdata)
 184{
 185	int i, in_use = 0;
 186	for (i = 0; i < pool->size; ++i) {
 187		if (atomic_read(&pool->events[i].free) != 1)
 188			++in_use;
 189		if (pool->events[i].ext_list) {
 190			dma_free_coherent(hostdata->dev,
 191				  SG_ALL * sizeof(struct srp_direct_buf),
 192				  pool->events[i].ext_list,
 193				  pool->events[i].ext_list_token);
 194		}
 195	}
 196	if (in_use)
 197		dev_warn(hostdata->dev, "releasing event pool with %d "
 198			 "events still in use?\n", in_use);
 199	kfree(pool->events);
 200	dma_free_coherent(hostdata->dev,
 201			  pool->size * sizeof(*pool->iu_storage),
 202			  pool->iu_storage, pool->iu_token);
 203}
 204
 205/**
 206 * valid_event_struct: - Determines if event is valid.
 207 * @pool:	event_pool that contains the event
 208 * @evt:	srp_event_struct to be checked for validity
 209 *
 210 * Returns zero if event is invalid, one otherwise.
 211*/
 212static int valid_event_struct(struct event_pool *pool,
 213				struct srp_event_struct *evt)
 214{
 215	int index = evt - pool->events;
 216	if (index < 0 || index >= pool->size)	/* outside of bounds */
 217		return 0;
 218	if (evt != pool->events + index)	/* unaligned */
 219		return 0;
 220	return 1;
 221}
 222
 223/**
 224 * ibmvscsi_free-event_struct: - Changes status of event to "free"
 225 * @pool:	event_pool that contains the event
 226 * @evt:	srp_event_struct to be modified
 227 *
 228*/
 229static void free_event_struct(struct event_pool *pool,
 230				       struct srp_event_struct *evt)
 231{
 232	if (!valid_event_struct(pool, evt)) {
 233		dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
 234			"(not in pool %p)\n", evt, pool->events);
 235		return;
 236	}
 237	if (atomic_inc_return(&evt->free) != 1) {
 238		dev_err(evt->hostdata->dev, "Freeing event_struct %p "
 239			"which is not in use!\n", evt);
 240		return;
 241	}
 242}
 243
 244/**
 245 * get_evt_struct: - Gets the next free event in pool
 246 * @pool:	event_pool that contains the events to be searched
 247 *
 248 * Returns the next event in "free" state, and NULL if none are free.
 249 * Note that no synchronization is done here, we assume the host_lock
 250 * will syncrhonze things.
 251*/
 252static struct srp_event_struct *get_event_struct(struct event_pool *pool)
 253{
 254	int i;
 255	int poolsize = pool->size;
 256	int offset = pool->next;
 257
 258	for (i = 0; i < poolsize; i++) {
 259		offset = (offset + 1) % poolsize;
 260		if (!atomic_dec_if_positive(&pool->events[offset].free)) {
 261			pool->next = offset;
 262			return &pool->events[offset];
 263		}
 264	}
 265
 266	printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
 267	return NULL;
 268}
 269
 270/**
 271 * init_event_struct: Initialize fields in an event struct that are always 
 272 *                    required.
 273 * @evt:        The event
 274 * @done:       Routine to call when the event is responded to
 275 * @format:     SRP or MAD format
 276 * @timeout:    timeout value set in the CRQ
 277 */
 278static void init_event_struct(struct srp_event_struct *evt_struct,
 279			      void (*done) (struct srp_event_struct *),
 280			      u8 format,
 281			      int timeout)
 282{
 283	evt_struct->cmnd = NULL;
 284	evt_struct->cmnd_done = NULL;
 285	evt_struct->sync_srp = NULL;
 286	evt_struct->crq.format = format;
 287	evt_struct->crq.timeout = timeout;
 288	evt_struct->done = done;
 289}
 290
 291/* ------------------------------------------------------------
 292 * Routines for receiving SCSI responses from the hosting partition
 293 */
 294
 295/**
 296 * set_srp_direction: Set the fields in the srp related to data
 297 *     direction and number of buffers based on the direction in
 298 *     the scsi_cmnd and the number of buffers
 299 */
 300static void set_srp_direction(struct scsi_cmnd *cmd,
 301			      struct srp_cmd *srp_cmd, 
 302			      int numbuf)
 303{
 304	u8 fmt;
 305
 306	if (numbuf == 0)
 307		return;
 308	
 309	if (numbuf == 1)
 310		fmt = SRP_DATA_DESC_DIRECT;
 311	else {
 312		fmt = SRP_DATA_DESC_INDIRECT;
 313		numbuf = min(numbuf, MAX_INDIRECT_BUFS);
 314
 315		if (cmd->sc_data_direction == DMA_TO_DEVICE)
 316			srp_cmd->data_out_desc_cnt = numbuf;
 317		else
 318			srp_cmd->data_in_desc_cnt = numbuf;
 319	}
 320
 321	if (cmd->sc_data_direction == DMA_TO_DEVICE)
 322		srp_cmd->buf_fmt = fmt << 4;
 323	else
 324		srp_cmd->buf_fmt = fmt;
 325}
 326
 327/**
 328 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
 329 * @cmd:	srp_cmd whose additional_data member will be unmapped
 330 * @dev:	device for which the memory is mapped
 331 *
 332*/
 333static void unmap_cmd_data(struct srp_cmd *cmd,
 334			   struct srp_event_struct *evt_struct,
 335			   struct device *dev)
 336{
 337	u8 out_fmt, in_fmt;
 338
 339	out_fmt = cmd->buf_fmt >> 4;
 340	in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
 341
 342	if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
 343		return;
 344
 345	if (evt_struct->cmnd)
 346		scsi_dma_unmap(evt_struct->cmnd);
 347}
 348
 349static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
 350		       struct srp_direct_buf *md)
 351{
 352	int i;
 353	struct scatterlist *sg;
 354	u64 total_length = 0;
 355
 356	scsi_for_each_sg(cmd, sg, nseg, i) {
 357		struct srp_direct_buf *descr = md + i;
 358		descr->va = sg_dma_address(sg);
 359		descr->len = sg_dma_len(sg);
 360		descr->key = 0;
 361		total_length += sg_dma_len(sg);
 362 	}
 363	return total_length;
 364}
 365
 366/**
 367 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
 368 * @cmd:	Scsi_Cmnd with the scatterlist
 369 * @srp_cmd:	srp_cmd that contains the memory descriptor
 370 * @dev:	device for which to map dma memory
 371 *
 372 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
 373 * Returns 1 on success.
 374*/
 375static int map_sg_data(struct scsi_cmnd *cmd,
 376		       struct srp_event_struct *evt_struct,
 377		       struct srp_cmd *srp_cmd, struct device *dev)
 378{
 379
 380	int sg_mapped;
 381	u64 total_length = 0;
 382	struct srp_direct_buf *data =
 383		(struct srp_direct_buf *) srp_cmd->add_data;
 384	struct srp_indirect_buf *indirect =
 385		(struct srp_indirect_buf *) data;
 386
 387	sg_mapped = scsi_dma_map(cmd);
 388	if (!sg_mapped)
 389		return 1;
 390	else if (sg_mapped < 0)
 391		return 0;
 392
 393	set_srp_direction(cmd, srp_cmd, sg_mapped);
 394
 395	/* special case; we can use a single direct descriptor */
 396	if (sg_mapped == 1) {
 397		map_sg_list(cmd, sg_mapped, data);
 398		return 1;
 399	}
 400
 401	indirect->table_desc.va = 0;
 402	indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
 
 403	indirect->table_desc.key = 0;
 404
 405	if (sg_mapped <= MAX_INDIRECT_BUFS) {
 406		total_length = map_sg_list(cmd, sg_mapped,
 407					   &indirect->desc_list[0]);
 408		indirect->len = total_length;
 409		return 1;
 410	}
 411
 412	/* get indirect table */
 413	if (!evt_struct->ext_list) {
 414		evt_struct->ext_list = (struct srp_direct_buf *)
 415			dma_alloc_coherent(dev,
 416					   SG_ALL * sizeof(struct srp_direct_buf),
 417					   &evt_struct->ext_list_token, 0);
 418		if (!evt_struct->ext_list) {
 419			if (!firmware_has_feature(FW_FEATURE_CMO))
 420				sdev_printk(KERN_ERR, cmd->device,
 421				            "Can't allocate memory "
 422				            "for indirect table\n");
 423			scsi_dma_unmap(cmd);
 424			return 0;
 425		}
 426	}
 427
 428	total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
 429
 430	indirect->len = total_length;
 431	indirect->table_desc.va = evt_struct->ext_list_token;
 432	indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
 
 433	memcpy(indirect->desc_list, evt_struct->ext_list,
 434	       MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
 435 	return 1;
 436}
 437
 438/**
 439 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
 440 * @cmd:	struct scsi_cmnd with the memory to be mapped
 441 * @srp_cmd:	srp_cmd that contains the memory descriptor
 442 * @dev:	dma device for which to map dma memory
 443 *
 444 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds 
 445 * Returns 1 on success.
 446*/
 447static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
 448				struct srp_event_struct *evt_struct,
 449				struct srp_cmd *srp_cmd, struct device *dev)
 450{
 451	switch (cmd->sc_data_direction) {
 452	case DMA_FROM_DEVICE:
 453	case DMA_TO_DEVICE:
 454		break;
 455	case DMA_NONE:
 456		return 1;
 457	case DMA_BIDIRECTIONAL:
 458		sdev_printk(KERN_ERR, cmd->device,
 459			    "Can't map DMA_BIDIRECTIONAL to read/write\n");
 460		return 0;
 461	default:
 462		sdev_printk(KERN_ERR, cmd->device,
 463			    "Unknown data direction 0x%02x; can't map!\n",
 464			    cmd->sc_data_direction);
 465		return 0;
 466	}
 467
 468	return map_sg_data(cmd, evt_struct, srp_cmd, dev);
 469}
 470
 471/**
 472 * purge_requests: Our virtual adapter just shut down.  purge any sent requests
 473 * @hostdata:    the adapter
 474 */
 475static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
 476{
 477	struct srp_event_struct *evt;
 478	unsigned long flags;
 479
 480	spin_lock_irqsave(hostdata->host->host_lock, flags);
 481	while (!list_empty(&hostdata->sent)) {
 482		evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
 483		list_del(&evt->list);
 484		del_timer(&evt->timer);
 485
 486		spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 487		if (evt->cmnd) {
 488			evt->cmnd->result = (error_code << 16);
 489			unmap_cmd_data(&evt->iu.srp.cmd, evt,
 490				       evt->hostdata->dev);
 491			if (evt->cmnd_done)
 492				evt->cmnd_done(evt->cmnd);
 493		} else if (evt->done)
 
 494			evt->done(evt);
 495		free_event_struct(&evt->hostdata->pool, evt);
 496		spin_lock_irqsave(hostdata->host->host_lock, flags);
 497	}
 498	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 499}
 500
 501/**
 502 * ibmvscsi_reset_host - Reset the connection to the server
 503 * @hostdata:	struct ibmvscsi_host_data to reset
 504*/
 505static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
 506{
 507	scsi_block_requests(hostdata->host);
 508	atomic_set(&hostdata->request_limit, 0);
 509
 510	purge_requests(hostdata, DID_ERROR);
 511	hostdata->reset_crq = 1;
 512	wake_up(&hostdata->work_wait_q);
 513}
 514
 515/**
 516 * ibmvscsi_timeout - Internal command timeout handler
 517 * @evt_struct:	struct srp_event_struct that timed out
 518 *
 519 * Called when an internally generated command times out
 520*/
 521static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
 522{
 
 523	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 524
 525	dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
 526		evt_struct->iu.srp.cmd.opcode);
 527
 528	ibmvscsi_reset_host(hostdata);
 529}
 530
 531
 532/* ------------------------------------------------------------
 533 * Routines for sending and receiving SRPs
 534 */
 535/**
 536 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
 537 * @evt_struct:	evt_struct to be sent
 538 * @hostdata:	ibmvscsi_host_data of host
 539 * @timeout:	timeout in seconds - 0 means do not time command
 540 *
 541 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
 542 * Note that this routine assumes that host_lock is held for synchronization
 543*/
 544static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
 545				   struct ibmvscsi_host_data *hostdata,
 546				   unsigned long timeout)
 547{
 548	u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
 549	int request_status = 0;
 550	int rc;
 551	int srp_req = 0;
 552
 553	/* If we have exhausted our request limit, just fail this request,
 554	 * unless it is for a reset or abort.
 555	 * Note that there are rare cases involving driver generated requests 
 556	 * (such as task management requests) that the mid layer may think we
 557	 * can handle more requests (can_queue) when we actually can't
 558	 */
 559	if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
 560		srp_req = 1;
 561		request_status =
 562			atomic_dec_if_positive(&hostdata->request_limit);
 563		/* If request limit was -1 when we started, it is now even
 564		 * less than that
 565		 */
 566		if (request_status < -1)
 567			goto send_error;
 568		/* Otherwise, we may have run out of requests. */
 569		/* If request limit was 0 when we started the adapter is in the
 570		 * process of performing a login with the server adapter, or
 571		 * we may have run out of requests.
 572		 */
 573		else if (request_status == -1 &&
 574		         evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
 575			goto send_busy;
 576		/* Abort and reset calls should make it through.
 577		 * Nothing except abort and reset should use the last two
 578		 * slots unless we had two or less to begin with.
 579		 */
 580		else if (request_status < 2 &&
 581		         evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
 582			/* In the case that we have less than two requests
 583			 * available, check the server limit as a combination
 584			 * of the request limit and the number of requests
 585			 * in-flight (the size of the send list).  If the
 586			 * server limit is greater than 2, return busy so
 587			 * that the last two are reserved for reset and abort.
 588			 */
 589			int server_limit = request_status;
 590			struct srp_event_struct *tmp_evt;
 591
 592			list_for_each_entry(tmp_evt, &hostdata->sent, list) {
 593				server_limit++;
 594			}
 595
 596			if (server_limit > 2)
 597				goto send_busy;
 598		}
 599	}
 600
 601	/* Copy the IU into the transfer area */
 602	*evt_struct->xfer_iu = evt_struct->iu;
 603	evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
 604
 605	/* Add this to the sent list.  We need to do this 
 606	 * before we actually send 
 607	 * in case it comes back REALLY fast
 608	 */
 609	list_add_tail(&evt_struct->list, &hostdata->sent);
 610
 611	init_timer(&evt_struct->timer);
 612	if (timeout) {
 613		evt_struct->timer.data = (unsigned long) evt_struct;
 614		evt_struct->timer.expires = jiffies + (timeout * HZ);
 615		evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
 616		add_timer(&evt_struct->timer);
 617	}
 618
 619	if ((rc =
 620	     ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
 
 621		list_del(&evt_struct->list);
 622		del_timer(&evt_struct->timer);
 623
 624		/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
 625		 * Firmware will send a CRQ with a transport event (0xFF) to
 626		 * tell this client what has happened to the transport.  This
 627		 * will be handled in ibmvscsi_handle_crq()
 628		 */
 629		if (rc == H_CLOSED) {
 630			dev_warn(hostdata->dev, "send warning. "
 631			         "Receive queue closed, will retry.\n");
 632			goto send_busy;
 633		}
 634		dev_err(hostdata->dev, "send error %d\n", rc);
 635		if (srp_req)
 636			atomic_inc(&hostdata->request_limit);
 637		goto send_error;
 638	}
 639
 640	return 0;
 641
 642 send_busy:
 643	unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
 644
 645	free_event_struct(&hostdata->pool, evt_struct);
 646	if (srp_req && request_status != -1)
 647		atomic_inc(&hostdata->request_limit);
 648	return SCSI_MLQUEUE_HOST_BUSY;
 649
 650 send_error:
 651	unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
 652
 653	if (evt_struct->cmnd != NULL) {
 654		evt_struct->cmnd->result = DID_ERROR << 16;
 655		evt_struct->cmnd_done(evt_struct->cmnd);
 656	} else if (evt_struct->done)
 657		evt_struct->done(evt_struct);
 658
 659	free_event_struct(&hostdata->pool, evt_struct);
 660	return 0;
 661}
 662
 663/**
 664 * handle_cmd_rsp: -  Handle responses from commands
 665 * @evt_struct:	srp_event_struct to be handled
 666 *
 667 * Used as a callback by when sending scsi cmds.
 668 * Gets called by ibmvscsi_handle_crq()
 669*/
 670static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
 671{
 672	struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
 673	struct scsi_cmnd *cmnd = evt_struct->cmnd;
 674
 675	if (unlikely(rsp->opcode != SRP_RSP)) {
 676		if (printk_ratelimit())
 677			dev_warn(evt_struct->hostdata->dev,
 678				 "bad SRP RSP type %d\n", rsp->opcode);
 679	}
 680	
 681	if (cmnd) {
 682		cmnd->result |= rsp->status;
 683		if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
 684			memcpy(cmnd->sense_buffer,
 685			       rsp->data,
 686			       rsp->sense_data_len);
 687		unmap_cmd_data(&evt_struct->iu.srp.cmd, 
 688			       evt_struct, 
 689			       evt_struct->hostdata->dev);
 690
 691		if (rsp->flags & SRP_RSP_FLAG_DOOVER)
 692			scsi_set_resid(cmnd, rsp->data_out_res_cnt);
 
 693		else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
 694			scsi_set_resid(cmnd, rsp->data_in_res_cnt);
 695	}
 696
 697	if (evt_struct->cmnd_done)
 698		evt_struct->cmnd_done(cmnd);
 699}
 700
 701/**
 702 * lun_from_dev: - Returns the lun of the scsi device
 703 * @dev:	struct scsi_device
 704 *
 705*/
 706static inline u16 lun_from_dev(struct scsi_device *dev)
 707{
 708	return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
 709}
 710
 711/**
 712 * ibmvscsi_queue: - The queuecommand function of the scsi template 
 713 * @cmd:	struct scsi_cmnd to be executed
 714 * @done:	Callback function to be called when cmd is completed
 715*/
 716static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
 717				 void (*done) (struct scsi_cmnd *))
 718{
 719	struct srp_cmd *srp_cmd;
 720	struct srp_event_struct *evt_struct;
 721	struct srp_indirect_buf *indirect;
 722	struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
 723	u16 lun = lun_from_dev(cmnd->device);
 724	u8 out_fmt, in_fmt;
 725
 726	cmnd->result = (DID_OK << 16);
 727	evt_struct = get_event_struct(&hostdata->pool);
 728	if (!evt_struct)
 729		return SCSI_MLQUEUE_HOST_BUSY;
 730
 731	/* Set up the actual SRP IU */
 732	srp_cmd = &evt_struct->iu.srp.cmd;
 733	memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
 734	srp_cmd->opcode = SRP_CMD;
 735	memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
 736	srp_cmd->lun = ((u64) lun) << 48;
 737
 738	if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
 739		if (!firmware_has_feature(FW_FEATURE_CMO))
 740			sdev_printk(KERN_ERR, cmnd->device,
 741			            "couldn't convert cmd to srp_cmd\n");
 742		free_event_struct(&hostdata->pool, evt_struct);
 743		return SCSI_MLQUEUE_HOST_BUSY;
 744	}
 745
 746	init_event_struct(evt_struct,
 747			  handle_cmd_rsp,
 748			  VIOSRP_SRP_FORMAT,
 749			  cmnd->request->timeout/HZ);
 750
 751	evt_struct->cmnd = cmnd;
 752	evt_struct->cmnd_done = done;
 753
 754	/* Fix up dma address of the buffer itself */
 755	indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
 756	out_fmt = srp_cmd->buf_fmt >> 4;
 757	in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
 758	if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
 759	     out_fmt == SRP_DATA_DESC_INDIRECT) &&
 760	    indirect->table_desc.va == 0) {
 761		indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
 
 762			offsetof(struct srp_cmd, add_data) +
 763			offsetof(struct srp_indirect_buf, desc_list);
 764	}
 765
 766	return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
 767}
 768
 769static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
 770
 771/* ------------------------------------------------------------
 772 * Routines for driver initialization
 773 */
 774
 775/**
 776 * map_persist_bufs: - Pre-map persistent data for adapter logins
 777 * @hostdata:   ibmvscsi_host_data of host
 778 *
 779 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
 780 * Return 1 on error, 0 on success.
 781 */
 782static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
 783{
 784
 785	hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
 786					     sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
 787
 788	if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
 789		dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
 790		return 1;
 791	}
 792
 793	hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
 794						     &hostdata->madapter_info,
 795						     sizeof(hostdata->madapter_info),
 796						     DMA_BIDIRECTIONAL);
 797	if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
 798		dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
 799		dma_unmap_single(hostdata->dev, hostdata->caps_addr,
 800				 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
 801		return 1;
 802	}
 803
 804	return 0;
 805}
 806
 807/**
 808 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
 809 * @hostdata:   ibmvscsi_host_data of host
 810 *
 811 * Unmap the capabilities and adapter info DMA buffers
 812 */
 813static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
 814{
 815	dma_unmap_single(hostdata->dev, hostdata->caps_addr,
 816			 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
 817
 818	dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
 819			 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
 820}
 821
 822/**
 823 * login_rsp: - Handle response to SRP login request
 824 * @evt_struct:	srp_event_struct with the response
 825 *
 826 * Used as a "done" callback by when sending srp_login. Gets called
 827 * by ibmvscsi_handle_crq()
 828*/
 829static void login_rsp(struct srp_event_struct *evt_struct)
 830{
 831	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 832	switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
 833	case SRP_LOGIN_RSP:	/* it worked! */
 834		break;
 835	case SRP_LOGIN_REJ:	/* refused! */
 836		dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
 837			 evt_struct->xfer_iu->srp.login_rej.reason);
 838		/* Login failed.  */
 839		atomic_set(&hostdata->request_limit, -1);
 840		return;
 841	default:
 842		dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
 843			evt_struct->xfer_iu->srp.login_rsp.opcode);
 844		/* Login failed.  */
 845		atomic_set(&hostdata->request_limit, -1);
 846		return;
 847	}
 848
 849	dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
 850	hostdata->client_migrated = 0;
 851
 852	/* Now we know what the real request-limit is.
 853	 * This value is set rather than added to request_limit because
 854	 * request_limit could have been set to -1 by this client.
 855	 */
 856	atomic_set(&hostdata->request_limit,
 857		   evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
 858
 859	/* If we had any pending I/Os, kick them */
 860	scsi_unblock_requests(hostdata->host);
 861}
 862
 863/**
 864 * send_srp_login: - Sends the srp login
 865 * @hostdata:	ibmvscsi_host_data of host
 866 *
 867 * Returns zero if successful.
 868*/
 869static int send_srp_login(struct ibmvscsi_host_data *hostdata)
 870{
 871	int rc;
 872	unsigned long flags;
 873	struct srp_login_req *login;
 874	struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
 875
 876	BUG_ON(!evt_struct);
 877	init_event_struct(evt_struct, login_rsp,
 878			  VIOSRP_SRP_FORMAT, login_timeout);
 879
 880	login = &evt_struct->iu.srp.login_req;
 881	memset(login, 0, sizeof(*login));
 882	login->opcode = SRP_LOGIN_REQ;
 883	login->req_it_iu_len = sizeof(union srp_iu);
 884	login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
 
 885
 886	spin_lock_irqsave(hostdata->host->host_lock, flags);
 887	/* Start out with a request limit of 0, since this is negotiated in
 888	 * the login request we are just sending and login requests always
 889	 * get sent by the driver regardless of request_limit.
 890	 */
 891	atomic_set(&hostdata->request_limit, 0);
 892
 893	rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
 894	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 895	dev_info(hostdata->dev, "sent SRP login\n");
 896	return rc;
 897};
 898
 899/**
 900 * capabilities_rsp: - Handle response to MAD adapter capabilities request
 901 * @evt_struct:	srp_event_struct with the response
 902 *
 903 * Used as a "done" callback by when sending adapter_info.
 904 */
 905static void capabilities_rsp(struct srp_event_struct *evt_struct)
 906{
 907	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 908
 909	if (evt_struct->xfer_iu->mad.capabilities.common.status) {
 910		dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
 911			evt_struct->xfer_iu->mad.capabilities.common.status);
 912	} else {
 913		if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP)
 
 914			dev_info(hostdata->dev, "Partition migration not supported\n");
 915
 916		if (client_reserve) {
 917			if (hostdata->caps.reserve.common.server_support ==
 918			    SERVER_SUPPORTS_CAP)
 919				dev_info(hostdata->dev, "Client reserve enabled\n");
 920			else
 921				dev_info(hostdata->dev, "Client reserve not supported\n");
 922		}
 923	}
 924
 925	send_srp_login(hostdata);
 926}
 927
 928/**
 929 * send_mad_capabilities: - Sends the mad capabilities request
 930 *      and stores the result so it can be retrieved with
 931 * @hostdata:	ibmvscsi_host_data of host
 932 */
 933static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
 934{
 935	struct viosrp_capabilities *req;
 936	struct srp_event_struct *evt_struct;
 937	unsigned long flags;
 938	struct device_node *of_node = hostdata->dev->of_node;
 939	const char *location;
 940
 941	evt_struct = get_event_struct(&hostdata->pool);
 942	BUG_ON(!evt_struct);
 943
 944	init_event_struct(evt_struct, capabilities_rsp,
 945			  VIOSRP_MAD_FORMAT, info_timeout);
 946
 947	req = &evt_struct->iu.mad.capabilities;
 948	memset(req, 0, sizeof(*req));
 949
 950	hostdata->caps.flags = CAP_LIST_SUPPORTED;
 951	if (hostdata->client_migrated)
 952		hostdata->caps.flags |= CLIENT_MIGRATED;
 953
 954	strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
 955		sizeof(hostdata->caps.name));
 956	hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
 957
 958	location = of_get_property(of_node, "ibm,loc-code", NULL);
 959	location = location ? location : dev_name(hostdata->dev);
 960	strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
 961	hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
 962
 963	req->common.type = VIOSRP_CAPABILITIES_TYPE;
 964	req->buffer = hostdata->caps_addr;
 965
 966	hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES;
 967	hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration);
 968	hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP;
 969	hostdata->caps.migration.ecl = 1;
 
 
 
 970
 971	if (client_reserve) {
 972		hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES;
 973		hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve);
 974		hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP;
 975		hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2;
 976		req->common.length = sizeof(hostdata->caps);
 
 
 
 
 
 977	} else
 978		req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve);
 
 979
 980	spin_lock_irqsave(hostdata->host->host_lock, flags);
 981	if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
 982		dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
 983	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 984};
 985
 986/**
 987 * fast_fail_rsp: - Handle response to MAD enable fast fail
 988 * @evt_struct:	srp_event_struct with the response
 989 *
 990 * Used as a "done" callback by when sending enable fast fail. Gets called
 991 * by ibmvscsi_handle_crq()
 992 */
 993static void fast_fail_rsp(struct srp_event_struct *evt_struct)
 994{
 995	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 996	u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
 997
 998	if (status == VIOSRP_MAD_NOT_SUPPORTED)
 999		dev_err(hostdata->dev, "fast_fail not supported in server\n");
1000	else if (status == VIOSRP_MAD_FAILED)
1001		dev_err(hostdata->dev, "fast_fail request failed\n");
1002	else if (status != VIOSRP_MAD_SUCCESS)
1003		dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1004
1005	send_mad_capabilities(hostdata);
1006}
1007
1008/**
1009 * init_host - Start host initialization
1010 * @hostdata:	ibmvscsi_host_data of host
1011 *
1012 * Returns zero if successful.
1013 */
1014static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1015{
1016	int rc;
1017	unsigned long flags;
1018	struct viosrp_fast_fail *fast_fail_mad;
1019	struct srp_event_struct *evt_struct;
1020
1021	if (!fast_fail) {
1022		send_mad_capabilities(hostdata);
1023		return 0;
1024	}
1025
1026	evt_struct = get_event_struct(&hostdata->pool);
1027	BUG_ON(!evt_struct);
1028
1029	init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1030
1031	fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1032	memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1033	fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
1034	fast_fail_mad->common.length = sizeof(*fast_fail_mad);
1035
1036	spin_lock_irqsave(hostdata->host->host_lock, flags);
1037	rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1038	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1039	return rc;
1040}
1041
1042/**
1043 * adapter_info_rsp: - Handle response to MAD adapter info request
1044 * @evt_struct:	srp_event_struct with the response
1045 *
1046 * Used as a "done" callback by when sending adapter_info. Gets called
1047 * by ibmvscsi_handle_crq()
1048*/
1049static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1050{
1051	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1052
1053	if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1054		dev_err(hostdata->dev, "error %d getting adapter info\n",
1055			evt_struct->xfer_iu->mad.adapter_info.common.status);
1056	} else {
1057		dev_info(hostdata->dev, "host srp version: %s, "
1058			 "host partition %s (%d), OS %d, max io %u\n",
1059			 hostdata->madapter_info.srp_version,
1060			 hostdata->madapter_info.partition_name,
1061			 hostdata->madapter_info.partition_number,
1062			 hostdata->madapter_info.os_type,
1063			 hostdata->madapter_info.port_max_txu[0]);
1064		
1065		if (hostdata->madapter_info.port_max_txu[0]) 
1066			hostdata->host->max_sectors = 
1067				hostdata->madapter_info.port_max_txu[0] >> 9;
1068		
1069		if (hostdata->madapter_info.os_type == 3 &&
1070		    strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1071			dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1072				hostdata->madapter_info.srp_version);
1073			dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1074				MAX_INDIRECT_BUFS);
1075			hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1076		}
1077
1078		if (hostdata->madapter_info.os_type == 3) {
1079			enable_fast_fail(hostdata);
1080			return;
1081		}
1082	}
1083
1084	send_srp_login(hostdata);
1085}
1086
1087/**
1088 * send_mad_adapter_info: - Sends the mad adapter info request
1089 *      and stores the result so it can be retrieved with
1090 *      sysfs.  We COULD consider causing a failure if the
1091 *      returned SRP version doesn't match ours.
1092 * @hostdata:	ibmvscsi_host_data of host
1093 * 
1094 * Returns zero if successful.
1095*/
1096static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1097{
1098	struct viosrp_adapter_info *req;
1099	struct srp_event_struct *evt_struct;
1100	unsigned long flags;
1101
1102	evt_struct = get_event_struct(&hostdata->pool);
1103	BUG_ON(!evt_struct);
1104
1105	init_event_struct(evt_struct,
1106			  adapter_info_rsp,
1107			  VIOSRP_MAD_FORMAT,
1108			  info_timeout);
1109	
1110	req = &evt_struct->iu.mad.adapter_info;
1111	memset(req, 0x00, sizeof(*req));
1112	
1113	req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
1114	req->common.length = sizeof(hostdata->madapter_info);
1115	req->buffer = hostdata->adapter_info_addr;
1116
1117	spin_lock_irqsave(hostdata->host->host_lock, flags);
1118	if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1119		dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1120	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1121};
1122
1123/**
1124 * init_adapter: Start virtual adapter initialization sequence
1125 *
1126 */
1127static void init_adapter(struct ibmvscsi_host_data *hostdata)
1128{
1129	send_mad_adapter_info(hostdata);
1130}
1131
1132/**
1133 * sync_completion: Signal that a synchronous command has completed
1134 * Note that after returning from this call, the evt_struct is freed.
1135 * the caller waiting on this completion shouldn't touch the evt_struct
1136 * again.
1137 */
1138static void sync_completion(struct srp_event_struct *evt_struct)
1139{
1140	/* copy the response back */
1141	if (evt_struct->sync_srp)
1142		*evt_struct->sync_srp = *evt_struct->xfer_iu;
1143	
1144	complete(&evt_struct->comp);
1145}
1146
1147/**
1148 * ibmvscsi_abort: Abort a command...from scsi host template
1149 * send this over to the server and wait synchronously for the response
1150 */
1151static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1152{
1153	struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1154	struct srp_tsk_mgmt *tsk_mgmt;
1155	struct srp_event_struct *evt;
1156	struct srp_event_struct *tmp_evt, *found_evt;
1157	union viosrp_iu srp_rsp;
1158	int rsp_rc;
1159	unsigned long flags;
1160	u16 lun = lun_from_dev(cmd->device);
1161	unsigned long wait_switch = 0;
1162
1163	/* First, find this command in our sent list so we can figure
1164	 * out the correct tag
1165	 */
1166	spin_lock_irqsave(hostdata->host->host_lock, flags);
1167	wait_switch = jiffies + (init_timeout * HZ);
1168	do {
1169		found_evt = NULL;
1170		list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1171			if (tmp_evt->cmnd == cmd) {
1172				found_evt = tmp_evt;
1173				break;
1174			}
1175		}
1176
1177		if (!found_evt) {
1178			spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1179			return SUCCESS;
1180		}
1181
1182		evt = get_event_struct(&hostdata->pool);
1183		if (evt == NULL) {
1184			spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1185			sdev_printk(KERN_ERR, cmd->device,
1186				"failed to allocate abort event\n");
1187			return FAILED;
1188		}
1189	
1190		init_event_struct(evt,
1191				  sync_completion,
1192				  VIOSRP_SRP_FORMAT,
1193				  abort_timeout);
1194
1195		tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1196	
1197		/* Set up an abort SRP command */
1198		memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1199		tsk_mgmt->opcode = SRP_TSK_MGMT;
1200		tsk_mgmt->lun = ((u64) lun) << 48;
1201		tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1202		tsk_mgmt->task_tag = (u64) found_evt;
1203
1204		evt->sync_srp = &srp_rsp;
1205
1206		init_completion(&evt->comp);
1207		rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1208
1209		if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1210			break;
1211
1212		spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1213		msleep(10);
1214		spin_lock_irqsave(hostdata->host->host_lock, flags);
1215	} while (time_before(jiffies, wait_switch));
1216
1217	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1218
1219	if (rsp_rc != 0) {
1220		sdev_printk(KERN_ERR, cmd->device,
1221			    "failed to send abort() event. rc=%d\n", rsp_rc);
1222		return FAILED;
1223	}
1224
1225	sdev_printk(KERN_INFO, cmd->device,
1226                    "aborting command. lun 0x%llx, tag 0x%llx\n",
1227		    (((u64) lun) << 48), (u64) found_evt);
1228
1229	wait_for_completion(&evt->comp);
1230
1231	/* make sure we got a good response */
1232	if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1233		if (printk_ratelimit())
1234			sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1235				    srp_rsp.srp.rsp.opcode);
1236		return FAILED;
1237	}
1238
1239	if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1240		rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1241	else
1242		rsp_rc = srp_rsp.srp.rsp.status;
1243
1244	if (rsp_rc) {
1245		if (printk_ratelimit())
1246			sdev_printk(KERN_WARNING, cmd->device,
1247				    "abort code %d for task tag 0x%llx\n",
1248				    rsp_rc, tsk_mgmt->task_tag);
1249		return FAILED;
1250	}
1251
1252	/* Because we dropped the spinlock above, it's possible
1253	 * The event is no longer in our list.  Make sure it didn't
1254	 * complete while we were aborting
1255	 */
1256	spin_lock_irqsave(hostdata->host->host_lock, flags);
1257	found_evt = NULL;
1258	list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1259		if (tmp_evt->cmnd == cmd) {
1260			found_evt = tmp_evt;
1261			break;
1262		}
1263	}
1264
1265	if (found_evt == NULL) {
1266		spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1267		sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1268			    tsk_mgmt->task_tag);
1269		return SUCCESS;
1270	}
1271
1272	sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1273		    tsk_mgmt->task_tag);
1274
1275	cmd->result = (DID_ABORT << 16);
1276	list_del(&found_evt->list);
1277	unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1278		       found_evt->hostdata->dev);
1279	free_event_struct(&found_evt->hostdata->pool, found_evt);
1280	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1281	atomic_inc(&hostdata->request_limit);
1282	return SUCCESS;
1283}
1284
1285/**
1286 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host 
1287 * template send this over to the server and wait synchronously for the 
1288 * response
1289 */
1290static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1291{
1292	struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1293	struct srp_tsk_mgmt *tsk_mgmt;
1294	struct srp_event_struct *evt;
1295	struct srp_event_struct *tmp_evt, *pos;
1296	union viosrp_iu srp_rsp;
1297	int rsp_rc;
1298	unsigned long flags;
1299	u16 lun = lun_from_dev(cmd->device);
1300	unsigned long wait_switch = 0;
1301
1302	spin_lock_irqsave(hostdata->host->host_lock, flags);
1303	wait_switch = jiffies + (init_timeout * HZ);
1304	do {
1305		evt = get_event_struct(&hostdata->pool);
1306		if (evt == NULL) {
1307			spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1308			sdev_printk(KERN_ERR, cmd->device,
1309				"failed to allocate reset event\n");
1310			return FAILED;
1311		}
1312	
1313		init_event_struct(evt,
1314				  sync_completion,
1315				  VIOSRP_SRP_FORMAT,
1316				  reset_timeout);
1317
1318		tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1319
1320		/* Set up a lun reset SRP command */
1321		memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1322		tsk_mgmt->opcode = SRP_TSK_MGMT;
1323		tsk_mgmt->lun = ((u64) lun) << 48;
1324		tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1325
1326		evt->sync_srp = &srp_rsp;
1327
1328		init_completion(&evt->comp);
1329		rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1330
1331		if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1332			break;
1333
1334		spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1335		msleep(10);
1336		spin_lock_irqsave(hostdata->host->host_lock, flags);
1337	} while (time_before(jiffies, wait_switch));
1338
1339	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1340
1341	if (rsp_rc != 0) {
1342		sdev_printk(KERN_ERR, cmd->device,
1343			    "failed to send reset event. rc=%d\n", rsp_rc);
1344		return FAILED;
1345	}
1346
1347	sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1348		    (((u64) lun) << 48));
1349
1350	wait_for_completion(&evt->comp);
1351
1352	/* make sure we got a good response */
1353	if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1354		if (printk_ratelimit())
1355			sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1356				    srp_rsp.srp.rsp.opcode);
1357		return FAILED;
1358	}
1359
1360	if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1361		rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1362	else
1363		rsp_rc = srp_rsp.srp.rsp.status;
1364
1365	if (rsp_rc) {
1366		if (printk_ratelimit())
1367			sdev_printk(KERN_WARNING, cmd->device,
1368				    "reset code %d for task tag 0x%llx\n",
1369				    rsp_rc, tsk_mgmt->task_tag);
1370		return FAILED;
1371	}
1372
1373	/* We need to find all commands for this LUN that have not yet been
1374	 * responded to, and fail them with DID_RESET
1375	 */
1376	spin_lock_irqsave(hostdata->host->host_lock, flags);
1377	list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1378		if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1379			if (tmp_evt->cmnd)
1380				tmp_evt->cmnd->result = (DID_RESET << 16);
1381			list_del(&tmp_evt->list);
1382			unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1383				       tmp_evt->hostdata->dev);
1384			free_event_struct(&tmp_evt->hostdata->pool,
1385						   tmp_evt);
1386			atomic_inc(&hostdata->request_limit);
1387			if (tmp_evt->cmnd_done)
1388				tmp_evt->cmnd_done(tmp_evt->cmnd);
1389			else if (tmp_evt->done)
1390				tmp_evt->done(tmp_evt);
1391		}
1392	}
1393	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1394	return SUCCESS;
1395}
1396
1397/**
1398 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1399 * @cmd:	struct scsi_cmnd having problems
1400*/
1401static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1402{
1403	unsigned long wait_switch = 0;
1404	struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1405
1406	dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1407
1408	ibmvscsi_reset_host(hostdata);
1409
1410	for (wait_switch = jiffies + (init_timeout * HZ);
1411	     time_before(jiffies, wait_switch) &&
1412		     atomic_read(&hostdata->request_limit) < 2;) {
1413
1414		msleep(10);
1415	}
1416
1417	if (atomic_read(&hostdata->request_limit) <= 0)
1418		return FAILED;
1419
1420	return SUCCESS;
1421}
1422
1423/**
1424 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1425 * @crq:	Command/Response queue
1426 * @hostdata:	ibmvscsi_host_data of host
1427 *
1428*/
1429void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1430			 struct ibmvscsi_host_data *hostdata)
1431{
1432	long rc;
1433	unsigned long flags;
 
1434	struct srp_event_struct *evt_struct =
1435	    (struct srp_event_struct *)crq->IU_data_ptr;
1436	switch (crq->valid) {
1437	case 0xC0:		/* initialization */
1438		switch (crq->format) {
1439		case 0x01:	/* Initialization message */
1440			dev_info(hostdata->dev, "partner initialized\n");
1441			/* Send back a response */
1442			if ((rc = ibmvscsi_ops->send_crq(hostdata,
1443							 0xC002000000000000LL, 0)) == 0) {
1444				/* Now login */
1445				init_adapter(hostdata);
1446			} else {
1447				dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1448			}
1449
1450			break;
1451		case 0x02:	/* Initialization response */
1452			dev_info(hostdata->dev, "partner initialization complete\n");
1453
1454			/* Now login */
1455			init_adapter(hostdata);
1456			break;
1457		default:
1458			dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1459		}
1460		return;
1461	case 0xFF:	/* Hypervisor telling us the connection is closed */
1462		scsi_block_requests(hostdata->host);
1463		atomic_set(&hostdata->request_limit, 0);
1464		if (crq->format == 0x06) {
1465			/* We need to re-setup the interpartition connection */
1466			dev_info(hostdata->dev, "Re-enabling adapter!\n");
1467			hostdata->client_migrated = 1;
1468			hostdata->reenable_crq = 1;
1469			purge_requests(hostdata, DID_REQUEUE);
1470			wake_up(&hostdata->work_wait_q);
1471		} else {
1472			dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1473				crq->format);
1474			ibmvscsi_reset_host(hostdata);
1475		}
1476		return;
1477	case 0x80:		/* real payload */
1478		break;
1479	default:
1480		dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1481			crq->valid);
1482		return;
1483	}
1484
1485	/* The only kind of payload CRQs we should get are responses to
1486	 * things we send. Make sure this response is to something we
1487	 * actually sent
1488	 */
1489	if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1490		dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1491		       (void *)crq->IU_data_ptr);
1492		return;
1493	}
1494
1495	if (atomic_read(&evt_struct->free)) {
1496		dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1497			(void *)crq->IU_data_ptr);
1498		return;
1499	}
1500
1501	if (crq->format == VIOSRP_SRP_FORMAT)
1502		atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1503			   &hostdata->request_limit);
1504
1505	del_timer(&evt_struct->timer);
1506
1507	if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1508		evt_struct->cmnd->result = DID_ERROR << 16;
1509	if (evt_struct->done)
1510		evt_struct->done(evt_struct);
1511	else
1512		dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1513
1514	/*
1515	 * Lock the host_lock before messing with these structures, since we
1516	 * are running in a task context
1517	 */
1518	spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1519	list_del(&evt_struct->list);
1520	free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1521	spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1522}
1523
1524/**
1525 * ibmvscsi_get_host_config: Send the command to the server to get host
1526 * configuration data.  The data is opaque to us.
1527 */
1528static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1529				   unsigned char *buffer, int length)
1530{
1531	struct viosrp_host_config *host_config;
1532	struct srp_event_struct *evt_struct;
1533	unsigned long flags;
1534	dma_addr_t addr;
1535	int rc;
1536
1537	evt_struct = get_event_struct(&hostdata->pool);
1538	if (!evt_struct) {
1539		dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1540		return -1;
1541	}
1542
1543	init_event_struct(evt_struct,
1544			  sync_completion,
1545			  VIOSRP_MAD_FORMAT,
1546			  info_timeout);
1547
1548	host_config = &evt_struct->iu.mad.host_config;
1549
1550	/* Set up a lun reset SRP command */
1551	memset(host_config, 0x00, sizeof(*host_config));
1552	host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1553	host_config->common.length = length;
1554	host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1555						    length,
1556						    DMA_BIDIRECTIONAL);
1557
1558	if (dma_mapping_error(hostdata->dev, host_config->buffer)) {
1559		if (!firmware_has_feature(FW_FEATURE_CMO))
1560			dev_err(hostdata->dev,
1561			        "dma_mapping error getting host config\n");
1562		free_event_struct(&hostdata->pool, evt_struct);
1563		return -1;
1564	}
1565
1566	init_completion(&evt_struct->comp);
1567	spin_lock_irqsave(hostdata->host->host_lock, flags);
1568	rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1569	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1570	if (rc == 0)
1571		wait_for_completion(&evt_struct->comp);
1572	dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1573
1574	return rc;
1575}
1576
1577/**
1578 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1579 * @sdev:	struct scsi_device device to configure
1580 *
1581 * Enable allow_restart for a device if it is a disk.  Adjust the
1582 * queue_depth here also as is required by the documentation for
1583 * struct scsi_host_template.
1584 */
1585static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1586{
1587	struct Scsi_Host *shost = sdev->host;
1588	unsigned long lock_flags = 0;
1589
1590	spin_lock_irqsave(shost->host_lock, lock_flags);
1591	if (sdev->type == TYPE_DISK) {
1592		sdev->allow_restart = 1;
1593		blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1594	}
1595	scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1596	spin_unlock_irqrestore(shost->host_lock, lock_flags);
1597	return 0;
1598}
1599
1600/**
1601 * ibmvscsi_change_queue_depth - Change the device's queue depth
1602 * @sdev:	scsi device struct
1603 * @qdepth:	depth to set
1604 * @reason:	calling context
1605 *
1606 * Return value:
1607 * 	actual depth set
1608 **/
1609static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth,
1610				       int reason)
1611{
1612	if (reason != SCSI_QDEPTH_DEFAULT)
1613		return -EOPNOTSUPP;
1614
1615	if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1616		qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1617
1618	scsi_adjust_queue_depth(sdev, 0, qdepth);
1619	return sdev->queue_depth;
1620}
1621
1622/* ------------------------------------------------------------
1623 * sysfs attributes
1624 */
1625static ssize_t show_host_vhost_loc(struct device *dev,
1626				   struct device_attribute *attr, char *buf)
1627{
1628	struct Scsi_Host *shost = class_to_shost(dev);
1629	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1630	int len;
1631
1632	len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1633		       hostdata->caps.loc);
1634	return len;
1635}
1636
1637static struct device_attribute ibmvscsi_host_vhost_loc = {
1638	.attr = {
1639		 .name = "vhost_loc",
1640		 .mode = S_IRUGO,
1641		 },
1642	.show = show_host_vhost_loc,
1643};
1644
1645static ssize_t show_host_vhost_name(struct device *dev,
1646				    struct device_attribute *attr, char *buf)
1647{
1648	struct Scsi_Host *shost = class_to_shost(dev);
1649	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1650	int len;
1651
1652	len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1653		       hostdata->caps.name);
1654	return len;
1655}
1656
1657static struct device_attribute ibmvscsi_host_vhost_name = {
1658	.attr = {
1659		 .name = "vhost_name",
1660		 .mode = S_IRUGO,
1661		 },
1662	.show = show_host_vhost_name,
1663};
1664
1665static ssize_t show_host_srp_version(struct device *dev,
1666				     struct device_attribute *attr, char *buf)
1667{
1668	struct Scsi_Host *shost = class_to_shost(dev);
1669	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1670	int len;
1671
1672	len = snprintf(buf, PAGE_SIZE, "%s\n",
1673		       hostdata->madapter_info.srp_version);
1674	return len;
1675}
1676
1677static struct device_attribute ibmvscsi_host_srp_version = {
1678	.attr = {
1679		 .name = "srp_version",
1680		 .mode = S_IRUGO,
1681		 },
1682	.show = show_host_srp_version,
1683};
1684
1685static ssize_t show_host_partition_name(struct device *dev,
1686					struct device_attribute *attr,
1687					char *buf)
1688{
1689	struct Scsi_Host *shost = class_to_shost(dev);
1690	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1691	int len;
1692
1693	len = snprintf(buf, PAGE_SIZE, "%s\n",
1694		       hostdata->madapter_info.partition_name);
1695	return len;
1696}
1697
1698static struct device_attribute ibmvscsi_host_partition_name = {
1699	.attr = {
1700		 .name = "partition_name",
1701		 .mode = S_IRUGO,
1702		 },
1703	.show = show_host_partition_name,
1704};
1705
1706static ssize_t show_host_partition_number(struct device *dev,
1707					  struct device_attribute *attr,
1708					  char *buf)
1709{
1710	struct Scsi_Host *shost = class_to_shost(dev);
1711	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1712	int len;
1713
1714	len = snprintf(buf, PAGE_SIZE, "%d\n",
1715		       hostdata->madapter_info.partition_number);
1716	return len;
1717}
1718
1719static struct device_attribute ibmvscsi_host_partition_number = {
1720	.attr = {
1721		 .name = "partition_number",
1722		 .mode = S_IRUGO,
1723		 },
1724	.show = show_host_partition_number,
1725};
1726
1727static ssize_t show_host_mad_version(struct device *dev,
1728				     struct device_attribute *attr, char *buf)
1729{
1730	struct Scsi_Host *shost = class_to_shost(dev);
1731	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1732	int len;
1733
1734	len = snprintf(buf, PAGE_SIZE, "%d\n",
1735		       hostdata->madapter_info.mad_version);
1736	return len;
1737}
1738
1739static struct device_attribute ibmvscsi_host_mad_version = {
1740	.attr = {
1741		 .name = "mad_version",
1742		 .mode = S_IRUGO,
1743		 },
1744	.show = show_host_mad_version,
1745};
1746
1747static ssize_t show_host_os_type(struct device *dev,
1748				 struct device_attribute *attr, char *buf)
1749{
1750	struct Scsi_Host *shost = class_to_shost(dev);
1751	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1752	int len;
1753
1754	len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
 
1755	return len;
1756}
1757
1758static struct device_attribute ibmvscsi_host_os_type = {
1759	.attr = {
1760		 .name = "os_type",
1761		 .mode = S_IRUGO,
1762		 },
1763	.show = show_host_os_type,
1764};
1765
1766static ssize_t show_host_config(struct device *dev,
1767				struct device_attribute *attr, char *buf)
1768{
1769	struct Scsi_Host *shost = class_to_shost(dev);
1770	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1771
1772	/* returns null-terminated host config data */
1773	if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1774		return strlen(buf);
1775	else
1776		return 0;
1777}
1778
1779static struct device_attribute ibmvscsi_host_config = {
1780	.attr = {
1781		 .name = "config",
1782		 .mode = S_IRUGO,
1783		 },
1784	.show = show_host_config,
1785};
1786
1787static struct device_attribute *ibmvscsi_attrs[] = {
1788	&ibmvscsi_host_vhost_loc,
1789	&ibmvscsi_host_vhost_name,
1790	&ibmvscsi_host_srp_version,
1791	&ibmvscsi_host_partition_name,
1792	&ibmvscsi_host_partition_number,
1793	&ibmvscsi_host_mad_version,
1794	&ibmvscsi_host_os_type,
1795	&ibmvscsi_host_config,
1796	NULL
1797};
1798
1799/* ------------------------------------------------------------
1800 * SCSI driver registration
1801 */
1802static struct scsi_host_template driver_template = {
1803	.module = THIS_MODULE,
1804	.name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1805	.proc_name = "ibmvscsi",
1806	.queuecommand = ibmvscsi_queuecommand,
 
1807	.eh_abort_handler = ibmvscsi_eh_abort_handler,
1808	.eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1809	.eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
1810	.slave_configure = ibmvscsi_slave_configure,
1811	.change_queue_depth = ibmvscsi_change_queue_depth,
1812	.cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
1813	.can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
1814	.this_id = -1,
1815	.sg_tablesize = SG_ALL,
1816	.use_clustering = ENABLE_CLUSTERING,
1817	.shost_attrs = ibmvscsi_attrs,
1818};
1819
1820/**
1821 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1822 *
1823 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1824 *
1825 * Return value:
1826 *	Number of bytes of IO data the driver will need to perform well.
1827 */
1828static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
1829{
1830	/* iu_storage data allocated in initialize_event_pool */
1831	unsigned long desired_io = max_events * sizeof(union viosrp_iu);
1832
1833	/* add io space for sg data */
1834	desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
1835	                     IBMVSCSI_CMDS_PER_LUN_DEFAULT);
1836
1837	return desired_io;
1838}
1839
1840static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
1841{
1842	int rc;
1843	char *action = "reset";
1844
1845	if (hostdata->reset_crq) {
1846		smp_rmb();
1847		hostdata->reset_crq = 0;
1848
1849		rc = ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata);
1850		if (!rc)
1851			rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0);
1852		vio_enable_interrupts(to_vio_dev(hostdata->dev));
1853	} else if (hostdata->reenable_crq) {
1854		smp_rmb();
1855		action = "enable";
1856		rc = ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, hostdata);
1857		hostdata->reenable_crq = 0;
1858		if (!rc)
1859			rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0);
1860	} else
1861		return;
1862
1863	if (rc) {
1864		atomic_set(&hostdata->request_limit, -1);
1865		dev_err(hostdata->dev, "error after %s\n", action);
1866	}
1867
1868	scsi_unblock_requests(hostdata->host);
1869}
1870
1871static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
1872{
1873	if (kthread_should_stop())
1874		return 1;
1875	else if (hostdata->reset_crq) {
1876		smp_rmb();
1877		return 1;
1878	} else if (hostdata->reenable_crq) {
1879		smp_rmb();
1880		return 1;
1881	}
1882
1883	return 0;
1884}
1885
1886static int ibmvscsi_work(void *data)
1887{
1888	struct ibmvscsi_host_data *hostdata = data;
1889	int rc;
1890
1891	set_user_nice(current, -20);
1892
1893	while (1) {
1894		rc = wait_event_interruptible(hostdata->work_wait_q,
1895					      ibmvscsi_work_to_do(hostdata));
1896
1897		BUG_ON(rc);
1898
1899		if (kthread_should_stop())
1900			break;
1901
1902		ibmvscsi_do_work(hostdata);
1903	}
1904
1905	return 0;
1906}
1907
1908/**
1909 * Called by bus code for each adapter
1910 */
1911static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1912{
1913	struct ibmvscsi_host_data *hostdata;
1914	struct Scsi_Host *host;
1915	struct device *dev = &vdev->dev;
1916	struct srp_rport_identifiers ids;
1917	struct srp_rport *rport;
1918	unsigned long wait_switch = 0;
1919	int rc;
1920
1921	dev_set_drvdata(&vdev->dev, NULL);
1922
1923	host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1924	if (!host) {
1925		dev_err(&vdev->dev, "couldn't allocate host data\n");
1926		goto scsi_host_alloc_failed;
1927	}
1928
1929	host->transportt = ibmvscsi_transport_template;
1930	hostdata = shost_priv(host);
1931	memset(hostdata, 0x00, sizeof(*hostdata));
1932	INIT_LIST_HEAD(&hostdata->sent);
1933	init_waitqueue_head(&hostdata->work_wait_q);
1934	hostdata->host = host;
1935	hostdata->dev = dev;
1936	atomic_set(&hostdata->request_limit, -1);
1937	hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
1938
1939	if (map_persist_bufs(hostdata)) {
1940		dev_err(&vdev->dev, "couldn't map persistent buffers\n");
1941		goto persist_bufs_failed;
1942	}
1943
1944	hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
1945					    "ibmvscsi", host->host_no);
1946
1947	if (IS_ERR(hostdata->work_thread)) {
1948		dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
1949			PTR_ERR(hostdata->work_thread));
1950		goto init_crq_failed;
1951	}
1952
1953	rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events);
1954	if (rc != 0 && rc != H_RESOURCE) {
1955		dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
1956		goto kill_kthread;
1957	}
1958	if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
1959		dev_err(&vdev->dev, "couldn't initialize event pool\n");
1960		goto init_pool_failed;
1961	}
1962
1963	host->max_lun = 8;
1964	host->max_id = max_id;
1965	host->max_channel = max_channel;
1966	host->max_cmd_len = 16;
1967
 
 
 
 
1968	if (scsi_add_host(hostdata->host, hostdata->dev))
1969		goto add_host_failed;
1970
1971	/* we don't have a proper target_port_id so let's use the fake one */
1972	memcpy(ids.port_id, hostdata->madapter_info.partition_name,
1973	       sizeof(ids.port_id));
1974	ids.roles = SRP_RPORT_ROLE_TARGET;
1975	rport = srp_rport_add(host, &ids);
1976	if (IS_ERR(rport))
1977		goto add_srp_port_failed;
1978
1979	/* Try to send an initialization message.  Note that this is allowed
1980	 * to fail if the other end is not acive.  In that case we don't
1981	 * want to scan
1982	 */
1983	if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0
1984	    || rc == H_RESOURCE) {
1985		/*
1986		 * Wait around max init_timeout secs for the adapter to finish
1987		 * initializing. When we are done initializing, we will have a
1988		 * valid request_limit.  We don't want Linux scanning before
1989		 * we are ready.
1990		 */
1991		for (wait_switch = jiffies + (init_timeout * HZ);
1992		     time_before(jiffies, wait_switch) &&
1993		     atomic_read(&hostdata->request_limit) < 2;) {
1994
1995			msleep(10);
1996		}
1997
1998		/* if we now have a valid request_limit, initiate a scan */
1999		if (atomic_read(&hostdata->request_limit) > 0)
2000			scsi_scan_host(host);
2001	}
2002
2003	dev_set_drvdata(&vdev->dev, hostdata);
 
2004	return 0;
2005
2006      add_srp_port_failed:
2007	scsi_remove_host(hostdata->host);
2008      add_host_failed:
2009	release_event_pool(&hostdata->pool, hostdata);
2010      init_pool_failed:
2011	ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events);
2012      kill_kthread:
2013      kthread_stop(hostdata->work_thread);
2014      init_crq_failed:
2015	unmap_persist_bufs(hostdata);
2016      persist_bufs_failed:
2017	scsi_host_put(host);
2018      scsi_host_alloc_failed:
2019	return -1;
2020}
2021
2022static int ibmvscsi_remove(struct vio_dev *vdev)
2023{
2024	struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
 
2025	unmap_persist_bufs(hostdata);
2026	release_event_pool(&hostdata->pool, hostdata);
2027	ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata,
2028					max_events);
2029
2030	kthread_stop(hostdata->work_thread);
2031	srp_remove_host(hostdata->host);
2032	scsi_remove_host(hostdata->host);
2033	scsi_host_put(hostdata->host);
2034
2035	return 0;
2036}
2037
2038/**
2039 * ibmvscsi_resume: Resume from suspend
2040 * @dev:	device struct
2041 *
2042 * We may have lost an interrupt across suspend/resume, so kick the
2043 * interrupt handler
2044 */
2045static int ibmvscsi_resume(struct device *dev)
2046{
2047	struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2048	return ibmvscsi_ops->resume(hostdata);
 
 
 
2049}
2050
2051/**
2052 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we 
2053 * support.
2054 */
2055static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
2056	{"vscsi", "IBM,v-scsi"},
2057	{ "", "" }
2058};
2059MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2060
2061static struct dev_pm_ops ibmvscsi_pm_ops = {
2062	.resume = ibmvscsi_resume
2063};
2064
2065static struct vio_driver ibmvscsi_driver = {
2066	.id_table = ibmvscsi_device_table,
2067	.probe = ibmvscsi_probe,
2068	.remove = ibmvscsi_remove,
2069	.get_desired_dma = ibmvscsi_get_desired_dma,
2070	.driver = {
2071		.name = "ibmvscsi",
2072		.owner = THIS_MODULE,
2073		.pm = &ibmvscsi_pm_ops,
2074	}
2075};
2076
2077static struct srp_function_template ibmvscsi_transport_functions = {
2078};
2079
2080int __init ibmvscsi_module_init(void)
2081{
2082	int ret;
2083
2084	/* Ensure we have two requests to do error recovery */
2085	driver_template.can_queue = max_requests;
2086	max_events = max_requests + 2;
2087
2088	if (firmware_has_feature(FW_FEATURE_ISERIES))
2089		ibmvscsi_ops = &iseriesvscsi_ops;
2090	else if (firmware_has_feature(FW_FEATURE_VIO))
2091		ibmvscsi_ops = &rpavscsi_ops;
2092	else
2093		return -ENODEV;
2094
2095	ibmvscsi_transport_template =
2096		srp_attach_transport(&ibmvscsi_transport_functions);
2097	if (!ibmvscsi_transport_template)
2098		return -ENOMEM;
2099
2100	ret = vio_register_driver(&ibmvscsi_driver);
2101	if (ret)
2102		srp_release_transport(ibmvscsi_transport_template);
2103	return ret;
2104}
2105
2106void __exit ibmvscsi_module_exit(void)
2107{
2108	vio_unregister_driver(&ibmvscsi_driver);
2109	srp_release_transport(ibmvscsi_transport_template);
2110}
2111
2112module_init(ibmvscsi_module_init);
2113module_exit(ibmvscsi_module_exit);